<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Mermaid Flowchart Custom Pan Zoom Demo</title>
    <script src="https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js"></script>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.4/css/bulma.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css">
    <style>
        #svg-container {
            width: 100%;
            height: 600px;
            border: 1px solid #dbdbdb;
            overflow: hidden;
            position: relative;
            border-radius: 4px;
        }
        #mermaid-diagram {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
        }
        #mermaid-diagram svg {
            width: 100%;
            height: 100%;
        }
        .mermaid .node rect,
        .mermaid .node circle,
        .mermaid .node ellipse,
        .mermaid .node polygon,
        .mermaid .node path {
            stroke: #3298dc;
            stroke-width: 2px;
            fill: #ffffff;
            filter: url(#rough);
        }
        .mermaid .edgePath .path {
            stroke: #3298dc;
            stroke-width: 2px;
            filter: url(#rough);
        }
        .mermaid .label {
            font-family: BlinkMacSystemFont, -apple-system, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
            color: #4a4a4a;
        }
        .button-container {
            margin-top: 1rem;
        }
    </style>
</head>
<body>
    <section class="section">
        <div class="container">
            <h1 class="title">Mermaid Flowchart Demo</h1>
            <svg width="0" height="0">
                <defs>
                  <filter id="rough">
                    <feTurbulence type="turbulence" baseFrequency="0.02" numOctaves="3" result="noise" seed="0"/>
                    <feDisplacementMap in="SourceGraphic" in2="noise" scale="2" />
                  </filter>
                </defs>
            </svg>    
            <div id="svg-container">
                <div id="mermaid-diagram" class="mermaid">
                    flowchart TD
                        A["Cloud User"] -- CHF/EUR/... --> B("CLOUD MARKET PLACE<br>Discount based on position<br>in TF Liquidity Pool.") & B2(("ThreeFold<br>Liquidity Pool"))
                        B2 -- TFT or INCA --> B
                        B -- TFT or INCA --> C{"Proof Of Utilization"}
                        G["FARMING GRANTS<br>40m Tokens / Month"] --> I{"Proof Of Capacity<br>uptime, location, ..."}
                        I --> D["ThreeFold Farmers"]
                        C -- 80% --> D
                        C -- 10% --> E["ThreeFold Cooperative"] & F["Validators<br>Commercial Partners"]
                </div>
            </div>

            <div class="button-container">
                <button id="zoom-in" class="button is-small is-primary">
                    <span class="icon is-small">
                        <i class="fas fa-search-plus"></i>
                    </span>
                    <span>Zoom In</span>
                </button>
                <button id="zoom-out" class="button is-small is-info">
                    <span class="icon is-small">
                        <i class="fas fa-search-minus"></i>
                    </span>
                    <span>Zoom Out</span>
                </button>
                <button id="reset" class="button is-small is-warning">
                    <span class="icon is-small">
                        <i class="fas fa-undo"></i>
                    </span>
                    <span>Reset</span>
                </button>
            </div>
        </div>
    </section>

    <script>
        mermaid.initialize({
            startOnLoad: true,
            theme: 'default',
            themeVariables: {
                primaryColor: '#3298dc',
                primaryTextColor: '#ffffff',
                primaryBorderColor: '#3298dc',
                lineColor: '#3298dc',
                secondaryColor: '#3298dc',
                tertiaryColor: '#3298dc'
            },
            flowchart: {
                curve: 'basis',
                useMaxWidth: false,
                htmlLabels: true,
                diagramPadding: 8,
                nodeSpacing: 60,
                rankSpacing: 60,
                curve: 'basis'
            }
        });

        mermaid.init(undefined, "#mermaid-diagram").then(function() {
            const container = document.getElementById('svg-container');
            const diagram = document.getElementById('mermaid-diagram');
            let scale = 1;
            let panning = false;
            let start = { x: 0, y: 0 };
            let translate = { x: 0, y: 0 };

            function setTransform() {
                diagram.style.transform = `translate(${translate.x}px, ${translate.y}px) scale(${scale})`;
            }

            container.addEventListener('mousedown', (e) => {
                panning = true;
                start = { x: e.clientX - translate.x, y: e.clientY - translate.y };
            });

            container.addEventListener('mousemove', (e) => {
                if (!panning) return;
                translate = {
                    x: e.clientX - start.x,
                    y: e.clientY - start.y
                };
                setTransform();
            });

            container.addEventListener('mouseup', () => {
                panning = false;
            });

            container.addEventListener('mouseleave', () => {
                panning = false;
            });

            container.addEventListener('touchstart', (e) => {
                if (e.touches.length === 1) {
                    panning = true;
                    start = { x: e.touches[0].clientX - translate.x, y: e.touches[0].clientY - translate.y };
                }
            });

            container.addEventListener('touchmove', (e) => {
                if (!panning || e.touches.length !== 1) return;
                translate = {
                    x: e.touches[0].clientX - start.x,
                    y: e.touches[0].clientY - start.y
                };
                setTransform();
            });

            container.addEventListener('touchend', () => {
                panning = false;
            });

            container.addEventListener('wheel', (e) => {
                e.preventDefault();
                const xs = (e.clientX - translate.x) / scale;
                const ys = (e.clientY - translate.y) / scale;
                const delta = -e.deltaY;
                const newScale = scale * Math.pow(1.001, delta);
                scale = Math.min(Math.max(0.1, newScale), 10);
                translate = {
                    x: e.clientX - xs * scale,
                    y: e.clientY - ys * scale
                };
                setTransform();
            }, { passive: false });

            document.getElementById('zoom-in').addEventListener('click', () => {
                scale *= 1.2;
                setTransform();
            });

            document.getElementById('zoom-out').addEventListener('click', () => {
                scale /= 1.2;
                setTransform();
            });

            document.getElementById('reset').addEventListener('click', () => {
                scale = 1;
                translate = { x: 0, y: 0 };
                setTransform();
            });
        });
    </script>
</body>
</html>